Found at a Goodwill for $2 a few weeks ago, the Ace Pilot is a simple-looking, but feature-rich stapler. It has a unique anvil with a flip-up staple splayer rather than a two-position anvil that clicks into the two positions. It also features a ratcheted striker mechanism unique to these chrome Ace staplers, that makes it pretty much impossible to double-feed or jam the stapler. The tension spring is actually a spring steel band that retracts into the striker head like a tape measure, and thus can never be lost. There’s no provision that allows it to be opened up and used as a tacker, though, oddly.
The last patent number stamped into the bottom (2112941) is claimed by the internet to date this specimen to 1938, but the exact same design is still produced and sold today by Ace.